Projectile.



E. GATHMANN.

PROJEOTILE.

FILED JAN. 9

Patented Sept. 30, 1913 pair M PATENT QFFIQE:

EMIL GATHMANN, or BALTIMORE; MARYLAND, ASSIGNOR '10 onuoinnn strnn n COMPANY OF AMERICA, A CORPORATION OF NEW JERSEY. -f

rrtoJnc'rILn.

's pecificationof Letters Patent. I Patentedseph gf),

Application filed Ja nuary 9, 1913. Serial No. 741,065.

To all whomit may concern:

Be it known that I, EMIL GATHMANN, residing at Baltimore city, State of Maryland, a citizen of the United States, have invented or discovered a certain new and useful Improvement in Projectiles, of which improvement the following is a specification.

It is the objectof the invention to provide improved means for securing an impact or other capto the point or forward portion of a projectile, which may be easily and economically applied, and will firmly lock the cap againstany rotary movement. The invention alsohas the advantage that its use involves a minimum-sacrifice of metal from the pint of the projectile itself.

In the. .:ccompanying drawings Figure 1 is a vie-a in longitudinal section of the forward poi ion of a projectile having a cap secured th *eto in accordance with this invention in its preferred form; Fig. 2 is a view in crass-section upon the line IIII of Fig. 1. p

The 'cap 1 has the usual rear cavity 2 adapted to fit. upon the point 3 of the projeotile. The approved practice heretofore has been to form a continuous peripheral groove in the surface of the point of the projectile, and to either force the metal of the cap into said groove, or to form a cooperating groove in the inner surface of the capcavity; and to secure the cap in place by means of rods or keys inserted in the cooperating grooves. In the present invention, instead of a continuous peripheral groove being formed in the surface of the projectile-point, a plurality of fractional grooves a are formed in said surface, lying in a plane or planes at an angle to the axis of the projectile, and preferably perpendicular-thereto. These grooves are preferably formed tangential to the surface as shown in the drawings, that is to say, having their axes lying in lines truly'tangential to the surface, and their bases lying in straight lines forming chords of the peripheral circumference of the projectile-point.

Cooperating grooves 5 are formed in the inner surface of the cap-cavity, and passages 6, boredthrough the wall-of the cap, communicate with said cooperating grooves,

preferably at both ends thereof. Rods or,

keys 7 are then passed through said passages and said fractional cooperating grooves, and serve to firmly bind the cap to the projectilepoint and to lock it against any rotation thereon. The outer edges of the passages 6 may be made slightly flaring and the ends of the keys be swaged down upon such flaring.

edges, asindicated at 8, in order to lock the keys against any longitudinal movement.

It will be obvious to those skilled in the art that the shape and form of the cooperating grooves and their relative arrange,

grooves, and keys inclosed in said passages and grooves.

2. The combination of a projectile pro-.

vided on its outer surface with a plurality of tangential grooves each lying in a plane at an angle to the axis of the projectile, a cap having a cavity adapted to fit upon the projectile, cooperating grooves in the face of said cavity, passagesthrough the cap communicating with said cooperating grooves, and keys inclosed in said passages and grooves.

3. The combination of a projectile provided on its outer surface with a plurality of fractional grooves each lying in a plane at an angle to the axis of the projectile, a cap having a cavity adapted to fit upon the projectile and coiiperating grooves formed sages through the cap camnnmicating with sand grooves. 10

In testimony u hereof I have hereunto set my hand.

in the face of said cavity, and means for securing the cap to the pwjectile engaging said cofiperating groov 4. A cap for projeccnes 11* adapted to fit upon the pro ity of fractional grooves 501- of said cavity, each groove lying in a plane at an angle to the axis of the cap, and pas- Witnesses MAMIE MEWSHAW, ALEX C. GRQOME.

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